Deprecation warnings when compiling Registry and Parameterizer

[adklempner]

Invoking events without "emit" prefix is deprecated.

Registry.sol:186:13: Warning: Invoking events without "emit" prefix is deprecated.
            _TouchAndRemoved(_listingHash);
            ^----------------------------^
Parameterizer.sol:155:5: Warning: Invoking events without "emit" prefix is deprecated.
    _ReparameterizationProposal(_name, _value, propID, deposit, proposals[propID].appExpiry, msg.sender);

Easily fixed by adding the emit prefix to all events.

Use of the "var" keyword is deprecated.

Registry.sol:214:29: Warning: Use of the "var" keyword is deprecated.
        var (commitEndDate, revealEndDate,) = voting.pollMap(pollID);

Parameterizer.sol:189:25: Warning: Use of the "var" keyword is deprecated.
    var (commitEndDate, revealEndDate,) = voting.pollMap(pollID);

Not sure how to go about this one. Trying to store the result to a Poll struct gives a TypeError

Parameterizer.sol:189:5: TypeError: Too many components (5) in value for variable assignment (1 needed).
    PLCRVoting.Poll memory poll = voting.pollMap(pollID);
    ^--------------------------------------------------^

This declaration shadows an existing declaration.

Registry.sol:176:9: Warning: This declaration shadows an existing declaration.
        uint deposit = parameterizer.get("minDeposit");
        ^----------^
Registry.sol:115:5: The shadowed declaration is here:
    function deposit(bytes32 _listingHash, uint _amount) external {
    ^ (Relevant source part starts here and spans across multiple lines).

Can be fixed by changing uint deposit to uint minDeposit (seems more descriptive too)

[Shachindra]

I too would agree to change the "uint deposit" to "uint minDeposit" for clear understanding.